a.

1. 不生育的；不结果实的[Z]
   He had learnt early in his marriage that he was sterile.

   他结婚不久便得知他不能生育。

2. （植物）只具雄蕊的；雌雄蕊俱无的[Z]
3. 贫瘠的
4. 消过毒的，无菌的[Z]
5. 枯燥乏味的；无生气的
   a sterile style

   呆板的文体

6. 无效果的，无结果的

adj.

1. not able to produce children or young.
   ▸(of a plant) not able to produce fruit or seeds.
   ▸(of land or soil) too poor in quality to produce crops.
2. lacking in imagination, creativity, or excitement.
3. free from bacteria or other living microorganisms.